Drawing board



M. K. VON ZIMMERMANN 1,987,382

DRAWING BOARD Filed Dec. 8, 1933 s Sheets-Sheet 1 Jan. 8, 1935.

Jan. 8, 1935. M. K VON ZIMMERMANN 1,937,332

DRAWING BOARD Filed Dec. 8, 1933 5 Sheets-Sheet 2 25 Z6 5 Z/ Z73 F f3? 9 22 2K Z6 Z1 /III @zj i Z Aw:

Jan. 8, 1935. M K. VON ZIMMERMANN 1,987,382

. DRAWING BOARD Filed Dec. 8, 1935 3 Sheets-Sheet 3 Patented Jan. 8, 1935 ApplicatiomDecemben 8, 1933,. SeriaLNo. 701,551

' 9 Claims. (CI; 45-131') "My invention relates to drawing boardsand more especially to that type of board which has means integral therewith for holding the paper.

One-'object' of my invention is to'provide a draw 1? ing' or writing board' wherein one or-more sheets of paper may be easily, simply, yet securely fastened to the board on either side thereof. Still another object of my inventionis to provide straight-edges parallel with two adjacent edges of the-board, such straight-edges being" capableof'retraction' into theboard-whennot in use. A- further object of my invention is toprovide a convenient receptacle, integral with the board,

to hold draftsmens tools when not'in-use. Otherobjects and advantages of'my invention willappear from the drawingsin which-- Figure 1- isatopplan viewof one-type of board embodying my invention; Fig. 2 is a side elevation of thesame-board; Fig. 3' isa bottom plan view of this board; Fig. 4 is a fragmentary sec-- tional View "of the boardalong the line 4-4 of Fig; 1, showing one-of the straight edges in itsr'ece'ssed position; Fig. 5 is a viewsimilar to Fig. 4, but-showing the straight-edge in it'sraised or operative position; Fig. 6 is a view along theline 6-6 of Fig. '4, showing the straight-edge in its'recessed position; Fig. 7 is asimilar'view along-- theline 77 of'Fig. 5, showing-the-straight-edge in its raised position; Fig; 8' is a fragmentary vertical sectional view along the-line-88 of- Fig.

1, showing one'of the paper-holding clips in'more detail'i'Fig. 9 is a View of an alternative form of construction and mounting for the straight-edge; Fig, l'Oisa view along the line 1010 of Fig. 9; Fig.- 1 1" is a vertical sectional fragmentary view of 'stillanother form of my invention; Fig. 12 is a fragmentary horizontal sectional view of the embodiment shown in- Fig. 11, along the line 1212 of that view; Fig. 13 is atop plan view showing an' alternative arrangement of clips particularly adapted to larger boards; Fig. 14' is a view along. the line 14-44 of Fig. 13'; Fig; 15. is a topplan' view of a boardhaving a; receptacle: therein for draftsmens tools; and Fig; 16- is: an end view of the same board along the-line 16-16- of Fig.- 15.

. In the illustration, the drawing or writing board. is indicated by the. reference numeral 20.

This board has at the four corners thereof recesses or depressions 21. having. in the. centers V end; the-pins are placed'in improper relation withside", of isaid boarcl.v iNormally, these clips are entirely housed in such holes so that no part of them projects above either surface of the board; Parallel to twoadjacent sides of the board 20 are the metal straight-edges 22 and- 23'. Both straight-edges perform a similar function andare similarly mounted in the board so that we 5 gage the-slots 26. In this form of my device, the

straight-edge is raised or lowered by applying a-manual forcetending to move it longitudinally. I The-straight-edge is held in the raised position by engagement of the pins 25 with the enlargements 27 in the slots 26. In its lowered position, the straight-edge is retained either bygravity or by frictional contact with the walls of the groove 33. This form of support for the straightedge-is very effective in that it does not permit the straight-edge to becomeseparatedfromthe board.

The jaws 29 are so positioned as-toclamp on either-side of abutments 32 in the holes 57, said abutments being formed by the bottoms of the recesses 21. closedjby aplug 53 having therein a recess 50'; The clip 28' has an outwardly projecting" member 51 fitting in this recess, said member being inserted in the plug, and adapted to be fastened therein by ascrew 52 if desired, prior to the insert'ion of-the plug in the board. The plug may befastenedin the board in any convenient manner, asbygluing.

In; the. form of my device shown in Fig. 9, the straight edge 34- has extending downwardly therefrom two relatively short pins 35 adaptedto be received in the holes 36 in the bottom of. the groove, 44; The pins 35 are not symmetrically positioned, one of said pins being further, from the center of the straight-edge than the other. of said pins. The holes 36are so drilled as toreceive the pins in one position of the straight-edge. By removing this straight-edge from theboard, however, and turning it end for" the: holes 36 and. instead of engaging therewith, IGSt'OII the bottom of the groove 44, and support the straight-edge in a raised position as shown by the dotted. lines in Fig. 10.

The outer wall of the hole 57' is In the particular embodiment of my invention illustrated in Figs. 11 and 12, the pin 38 on the straight-edge 37 is provided with two vertically spaced grooves 39 and 40, and is adapted to recess in a hole 41 in the bottom of the groove 45. It is understood that the straight-edge 37 has a similar pin at or near its other end, and that the board has a hole adapted to receive said other pin. A spring 42 is so positioned that it makes contactwith groove 39 when the straight-edge 37 is in the recessed or flushed position, and with grooves 40 when the straight-edge is in raised or operative position. The tension of the spring is suiiicient to hold the straight-edge in either of the desired positions, yet is not so great as to prevent manual adjustment of the position of the straight-edge.

When it is desired to use this board, thesheet or sheets of paper to be worked on are. placed on one surface of the board with the corners thereof extending downwardly into the recesses: in said board, where said corners are clamped into position by the spring clips 28. One or both of the straight-edges may then be raised into operative position above the surface of the board,- said straight-edges being held in this raised p0 sition in any one of the manners shown in my drawings. A draftsmans triangle or'other drawing aid may then be used in conjunction with the straight-edges. This provides a very accurate and permanent basis for work, since these straight-edges do not shift out of relative alignment. When, at any time, the straight-edges would be in the way in their raised position, they are lowered into their receiving groovesin the board where they lie either flush with the surface of the board or slightly below it. When the board is in this condition, there are no projections of any kind to interfere with free movement over the surface of theboard or with free movement of the board on a table or other supporting surface.

trated in Figs. 13 and 14. In this embodiment of my device, the board 55 has grooves 56 adjacent the edges in both surfaces of the board. Spaced at intervals along the outer edge of these grooves are holes 57 extending through theboard,

and the clips 28 are then manually operated to' clamp the paper in position. This arrangement of clips is especially adapted to hold large sheets of material on large boards, or small sheets of rather stiff material are more advantageously held on the small boards.

Figures 15 and 16 illustrate one of my boards 20 with a receptacle or chamber 60 integral therewith for holding draftsmens tools, as a ,tri-

angle. This chamber lies between the two plies or surfaces 61 and 62 of the board 20, and is closed-on three sides, opening only at the end 64. This chamber is very easily manufactured where the boards are formed of three-ply wood,

for in that case the central ply 63 is cut in substantially the shape of a horseshoe prior to the application ofthe top and bottom plies 61 and 62. Tools and drafting aids, as a triangle, may

An alternative arrangement of clips is illusbe kept in this receptacle, and thus will be in convenient relation to the drawing board at all times.

The recessed spring clips are adapted to hold sheets of paper or other material on either side of the board, and it is to be understood that straight-edges may be provided on both the top and bottom surfaces of any of the boards illustrated, or around all four sides of one surface, as may be, deemed desirable.

While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in'the appended claims, in which it is my intention to claim all novelty inherent in my in- .vention as broadly as permissible, in view of the prior art.

What I claim as new and desire to secure by Letters Patent is:

1. A board of the character described havingholes in each of the four corners; abutments in said holes; and spring clips in said holes, whereby sheets of material to be worked on may simultaneously be clamped in contact with said abutments on both sides of said board.

2. A board of the character described having holes in each of the four corners; abutments in said holes; and spring clips with crossed jaws in said holes, said jaws being adapted to hold the material to be worked on in contact with said abutments.

. 3. A board of the character described having a hole therethrough adjacent one corner, the inner wall of said hole having anabutment thereon, and a spring clip located said hole, said spring clip having jaws adapted to engage said abutment simultaneously on each side thereof.

4. A board of the character described having a hole therethrough adjacent one corner, the outer ,wall of said hole being provided with a recess therein and the inner wall of said hole having an abutment :thereon, and a spring'clip located in said hole; said spring clip having jaws adaptedto engage said abutment and a supporting member extending into said recess.

5. A board of the character described having a hole therethrough adjacent one corner, the outer wall of saidhole being provided with a laterally extending hole, a plug located in said last mentioned hole, said plug being provided with a recess therein, and a spring-clip located in the hole through the board, said spring cliphaving a supporting member extending outwardly into said recess in said plug.

64A board of the character described having a hole therethrough adjacent one corner, the outer wall of said hole being provided with a recess therein and the inner wall of said hole having an abutment thereon, and a spring clip located in said hole, said spring clip comprising two metal stampings flexibly fastened at one end and having crossed jaws at the other end, said crossed jaws being adapted to be held in contact with said abutment bya compression spring between said members, and one of said members extendingoutwardly beyond said fastening point and fitting intosaid recess.

'7. A board of the character described having a hole therethrough adjacent one edge thereof, the inner wall of said hole having an abutment thereon, and a. spring clip located in said hole,

said spring clip having jaws adapted to engage said abutment simultaneously on each side thereof.

8. A board of the character described having a groove therein adjacent one edge thereof, and a hole therethrough in combination with said groove, the outer wall of said hole being provided with a laterally extending hole therein and the inner wall of said hole having an abutment thereon formed by the bottom of said groove, a plug located in said last mentioned hole, said plug being provided with a recess therein, and a spring clip located in the hole through the board, said spring clip having a supporting member extending outwardly into said recess in said plug,

said clip being adapted to elastically engage said abutment.

9. A multi-ply drawing board of the character described including a ply having a cutaway portion extending completely through and inwardly from one edge of said ply, plies on opposite sides of the first mentioned ply bridging said cut away portion to provide a chamber accessible at said edge for receiving drafting accessories and the like, and a hole extending through one of said last-mentioned plies and exposing a portion of said first mentioned ply, said exposed portion cooperating with means in said hole for securing paper and the like to said board.

MAX KURT i VON ZIMMERMANN- 

